Adjustable-rate mortgages provided the muscle for the Alternative A securitization market during the first half of the year, a new Inside Alternative Mortgages analysis reveals. Clearly, 2005 has been the year of the ARM in the alternative products market. Through the end of June, a record $142.83 billion in Alt A loans were securitized and ARMs accounted for more than two-thirds – 68.1 percent – of the period’s total volume. … [One data table included]